HIV-2 was discovered essentially simultaneously by French and U.S. teams. This was the first publication by the French team. Order of authorship of the original publication was Clavel, Guettard, Brun-Vezinet.  See their expanded report: Clavel, F., Mansinho, K. Chamaret, S.,et al with Montagnier, Luc. "Human immunodeficiency virus type 2 infection associated with AIDS in West Africa," New Eng. J. Med. 316 (1987) 1180-1185.